上部東京層の花粉分析

概要

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The core samples, obtained atSeijo-machi, Setagaya-ku, Tokyo, were examined pollen-analytically. The silt layer which contains these samples situates in the depth from 14.0 m to 23.3 m. This silt layer is stratigraphically correlated to the upper part of the Tokyo formation and which is corresponded to the middle mud-layer of the Shimosueyoshi formation. The results of the pollen analysis are following, 1) Lower part; (depth : 22.0-22.3 m) The genera indicating relatively cool climate are generally appeared. 2) Middle part; (depth : 16.0-21.3 m) Alnus and Ulmus or Zelkova are predominant. In this part, the remarkable changes of the predominant genera are not shown. 3) Upper part; (depth : 14.0-15.3 m) Tsuga and Cryptomeria are predominantly recognized. According to these results, the climatic conditions of the upper Tokyo formation are considered as follows: 1) In the uppermost part and in the lowermost part, there are relative cool periods. 2) The palaeo-climate appeared in the upper Tokyo formation is similar to or slightly. cooler than the present time.
地学団体研究会の論文
1970-01-25